The 4th draft of the script explains how Marty Mcfly and Doc Brown became friends (WILD!)

[valet]

 

[OJ Simpsom]

Doc

 

[Yaboysix]

"think of the weirdest possible explanation..."

Me:thinks of something freaky...

Reason... something freaky.

 

[Deltron]

i believe this was in the novelization

 

[WIA20XX]

Breaking Bad multiverse

 

[Jigganaut]

Lol they should have went with the dope.

 

[Neuromancer]

This kinda makes sense.

 

[GR13]

I always imaged Marty and doc brown being coming friend in the most most 80's way possible Marty being deliver driver of doc browns favorite pizza or Chinese food spot it was always my head cannon

 

[The Prince of All Saiyans]

smut peddlers always old as F-CK

 

[TrapHouse Rock]

Thats normal AF for the 80s

easiest hustles to get money on the low was bootlegging or drugs